Type-writing machine.



- P. 'A. YOUNG. TYPE WRITING MACHINE. APPLEOATION FILED r313. 18, 1911 Patented Mar. 4, 1913.

UNITED STATES PATENT OFFICE.

FRANK A. YOUNG, 01 NEW YORK, N. AssIGiIoR T UNpEnwooD TYPEWRITER COMPANY, or NEW YORK, N, Y., a ooRPoRA IoN or DELAWARE.

Machines, of which the following is a specification.

This invention relates to carriage feeding mechanism of typewrlting machines.

One of the objects of the invention is to.

simplify the construction and operation of the escapement devices, to render the same positive in action, and to avoid liability of the carriage over-feeding or jumping.- I aim to provide a feed which will be extremely sensitive and rapid, without liability of erratic action.

Another object isto improve the clutch connection between the usual pinion and escapement wheel, with a view of simplifying the same, and decreasing the cost of manufacture.

Other objects and advantages will hereinafter appear. In the accompanying drawings, Figure 1 is a perspective showing the escapement as applied to a typewriti'ng machine of the Underwood front strike construction, illustrating the universal bar which actuates the escapementand showing a portion of the universal bar broken away. Fig. 2 is a side elevation and partial cross-section through the escapement mechanism, and showing also a portion of the segment, indicating the usual manner of actuating the universal bar by the type bars. This View shows the escapement mechanism in the normal position. Fig. 3 is a view similar to Fig. 2, but showing the escapement held by the spacing pawl. Fig. 4 is a side elevation, showing the carriage rack in cross-section, and illustrat ing my improved form of one-way clutch connection for permittingthe returnof the carriage without'operating the escapement. Figs-5, Sand 7 are enlarged diagrams to indicate various relations which may exist between the escapement wheel and the feeding dogs which cooperate therewith.

1 represents the escapement frame, the lower portion of which is formed into feet 2 adapted to be attached to the typewriter frame, and the frame 1 further presents upwardly extending posts 3 and 4, the former of which is formed at its upper end into Specification of Letters Patent: Application filed February 18, '1911.

Patented Marl l, 1913. Seria1N.o,609,8 (i4.

' a bifurcated guidehead 5, having parallel forks 6 and]. The post- 4 is formed at its upper end'wit-h a horizontal inwardly projecting' arm-'8, which extends toward the bifurcated head 5, bnt to the rear thereof, as shown. On the forward side :of this arm 8, an escapement wheel .9 is rotatably mounted, and this wheel is ,in the form of a disk having a series of equidistant circularly-disposed openings 'or perforations 10, preferably formed near the edge thereof.

On the shaft-or pivot stud 11, upon which the escapement wheel is mounted, there-is also mounted a pinion 12 havingteeth which'may be inclined in theusualmanmer, as indicated; and these teeth are adapted to mesh with theteethof a rack 13 of the usual construction, which is attached in the usual manner to the carriage.

The forward face of-the-disk 91isformed with a hub having ratchet teeth 14, and corresponding'ratchet teeth 1'2 are formed on the inner facerof pinion 12; these teeth are inclined so as to permit a rotation of the pinion :in one direction independently of the disk, but preventing independent rotation in the opposite direction; The end of thestud or shaft 11 is provided with ascrew 15 which retains a coiled spring 16 disposed around the end of 'stud1l,,and this spring tends to hold the inclined teeth of the pinion and the hub offthe diskin engagement with each other. When the carriage is moved in a. direction to return it,'the.teeth' one-way clutch, permitting a relative rotation in one direction only. lhis clutch is of spec al advantage where it is desired to pr0- vide for manufacturing-the pinions 1-2 of a varying. diameters for different kinds of typewriting machines: since all, such pinions. (regardless of. their respective diameters), may be provided with similar clutch members 12, and hence they may be readily placed upon the machine without the neces-' sity of changes in. thexcon'struction or adjustment of the clutching device.

In escapement devices of the type illus- .trated, usually the carriage is under tension.

"tending to move it in the feeding directionf substantially in axial alinement with each but the carriage is normally prevented from mechanism.

In the forks 6 and 7 there is mounted to slide horizontally, and laterally to the disk face of the fork 6, so as to lie adjacent to the forward face of the disk 9 as indicated in Fig. 2. Between the forks 6 and 7, lies an arm 19 of a yoke 20, and this arm is rigidly and adjustably secured to the-pawl 17 by a set screw 21, as indicated. The rear portion of the .yoke '20 has a similar arm 22, andin this arm there is adjustably mounted a detent pawl or dog 23, secured in position by a set screw 24. Between the fork 6 and the arm 19 a coiled spring 25 is provided around the spacing pawl, and this spring thrusts against the'arm 19 and normally holdsthe spacing pawl, and yoke 20 in an extreme position toward the right, as indicated. in Fi 2.

is indicated in Figs. 2and 3, the spacing awl 17 and the detent pawl or do 23'are other; in the short space or gap between the two, the edge of the disk 9 lies so that as ,the wheel rotates, the escapement openings or holes 10 may pass in'succes'sion'before the pawls. The direction of the feed of the escapement wheel is that indicated by the arrow in Fig. -1, and the escapementwheel is detained normally by the end of the detent dog 23 resting against an edge 26). In this connection,, attention is called to the fact:

that the'rearmost edges of the openings 10, with respect to the direction of rotation, are beveled, and furthermore, the forward edges of the holes are rounded or beveled on both faces of the disk as indicated at 27.

A- universal bar 28 is mounted at its rear end on the usual rocker 29; and comprises the usual bow or bar 30 against which heels 31 01' type bars 32 are adapted to strike during the type action, operating in the usual manner to shift the universal bar rearwardly. One of these type bars is illustrated as hung from the'usual segment 33 in which extends downfrom the rocker 29, andis adapted to be actuated by an anti 35 which is moved chine.

A bracket 36 is secured on'the universal bar-near an opening 37. In .this opening there plays a shifting arm 38, secured at 39 to the bracket. The arm 38-has a supporting shoulder A0, and also a projecting by the space key of the matongue 41 to operate the spacing pawl 17..

When the universal bar is driven rearwardly, the spacing pawl 17 will be driven back. Since this spacing pawl is 1'5 idly connected with the detent dog 23, the .detent 2-3 is formed with *dog will also move back and 'become disenadvancing or feeding by the escapement 1 aged from the escapement wheel. IAs the dog 23 releasesthe escapement wheel, the

nose 18o'f the spacing pawl 17, which is A beveled slightly, thrust-s itselfinto the adja-' cent opening 10, andfholds the escapement wheel 9 against rotation. As; soon as the universal .bar returns under the action of its spring, '(not illustrated), the spring 251eturns the pa'wls or-dogs 17 and 23. The arrangement of-the pawls 17 and 23 isl such, that beforefthe spacing pawl 17 engages-the 'escapementwheel, it; permits a very slight 23 will return to the same opening 10, w iich it formerly occupied. The openings 10'are disposed very closely together, so that nar-- row-bridges or septums42 are formed at these points, these septums performing the functions of teeth. f

The forward end or nose of thedetent dog lower edge 44.

Pivoting the shifting arm 38 at the point a beveled oi" inclined 39 enables the tongue 41 tobe thrown to one side, so as to be out "of alinei'nent, with the spacing pawl 17, and this permits. a rearward movement 'of the. universal bar without affecting the escapement wheel. This is desired sometimes in making repairs or adjustments. 7

Attention is called to the fact that the escapement wheel constructed" as described, does not present teeth on its periphery, and this is advantageous'for the reason that then no projections are formed at this point that may catch in a cloth. when the typewriter is being cleaned, and this formv of wheel also prevents any injury to the hands of the operator, such as might occur in striking against a sharp tooth.

At Fig. -5, the dogs 23, 17 are illustrated i in normal positions, the escapement dog 23 being in engagement with the wheel, that is, inserted in oneof the holes 10in the wheel. Upon the depression of a key and a rearward stroke of the universal bar'30, the dogs 23, 17 are moved together to the Fig. 6 position, the dog 23 escaping from the wheel, and the beveled tip 18 of the dog 17 engaging the bevel 18 formed onthewheel tooth or septum. The wheel, which is running in the direction of the arrow, at Fig. 5, ad-

vances slightly during the movements of the parts'from Fig. 5 to Fig. 6, and consequently the dog 23 is prevented from resuming-its normal position with relation to the tooth or septum from which it has just escaped.

The bevel 18 of detent dog- 17 engagesthe bevel 18 on the wheel tooth, and the latter hence tends to return the dogs to normal positions, thus rendering the device very sensitive and quick-acting. Upon the relief of the finger-key from pressure, the dogl? escapes from the wheel, and the dog23 moves into the next hole in the wheel, as seen at Fig. 7. Usually the wheel tooth 42 remains in contact with. the dog 17 until the latter escapes, but Fig. 7 will show that in case the wheel should fail to do so, the dog 23 would nevertheless engage the nexthole in the wheel, and its beveled surface, by engaging the back of the septum, would tend to advancethe wheel in the direction in which it is being turned bythe carriage driving spring (not shown).

Variations may be resorted to within the scope of the invention, and portions of theimproven'ients may be used without others.

advance when said carriage advances,

Having thus described -my invention, I

claim: 1. In a typewriting machine having a reciprocating carriage, a member adapted to advance when said carriage advances and having a plurality of equidistant perforations formed therein, a detent pawl cooperating with the edges of said perforationson one side of said member, a spacing pawl fixed onsaid detent pawl cooperating'with the edges of said perforations on the other side of said member, and means for shifting said'pawls to permit a step-by-step advance of said member.

2. In a typewriting machine having a reciprocating carriage, a member adapted t3 an having a plurality of equidistant perforations formed therein, a detent pawl cooperating with the edges of said perforationson one side of said member, a spacing pawl fixed on said detent pawl cooperating with the edges of said perforations on the other side of said me1nber,.means for shifting said pawls to permit a step-by-step advance of said member, and a spring in connection f with said pawls normally holding said detent pawl in engagement with said member.

3. In a typewriting machine, an escapement wheel having a plurality of equidistant openings formed therein, the walls between said openings being pointed on one side and beveled on the other, a detent pawl normally engaging the pointed edge of one of said openings on one side of said wheel, a spacing pawl fixed to move with the detent pawl normally disposed adjacent to the beveled edge of one of said openings on theopposite side of said wheel, means for advancing said spacing pawl to engage the beveled edge of the openings and simultaneously withdrawing said detent pawl to permit an ,escapement movement of said wheel between said pawls, and means for returning said detent pawl to engage in the next opening .to arrest the rotation of said escapement wheel.

4Q In a typewriting machine, an escapement wheel mounted to rotate, a detent pawl wheel and an opposite inclined on one side of said wheel, said wheel having a thin tooth on the face thereof adjacent to said pawl and cotiperating with said pawl to prevent the rotation of said wheel, a second pawl on the opposite side of said wheel fixed relatively to the detent pawl, said wheel having" means on the face thereof adjacent'to said second pawl cooperating with said second pawl to permit a feeding move ment of said wheel, the distance between said pawls being s'uchthat one always intercepts said wheel and said feeding movement suflicient to carry the edge of said tooth past said detent pawl, and means for shift.- ing said pawls laterally with respect to said wheel to permit an escapement movement thereof. v

5. In a typewriting machine, the combination with a traveling carriage of an escapement member, two pawls relatively fixed and reciprocating to alternately engage said escapelnent member, one of said pawls normally carrying a beveled tooth, engaging said escapement with its fiat side against the corresponding flat side of a bevelededge onsaid escapement, the other pawl having a face arranged to arrest said me1nher after a slight feed so that on one stroke said escapement member is fed slightly, and

on 'the' return stroke said first pawl fails to arrest said escapement by the face which it previously engaged.

6. In a typewriting machine, the combination with a travellng carriage of anescapement member, two pawls relatively fixed and reciprocating to alternately engage said escapement member, one .of said pawls normally carrying a beveled tooth engaging said escapement with-its flat side against the corresponding flat side of a beveled edge on said escapement, the other pawl having a beveled face arranged to cooperate with a beveled face; on said escapement member giving a little lostmotion, so that on one stroke said escapement member is fed slightly, and on the return stroke said first pawl arrests said escapementby a face beyond the one it previously engaged.

7. In a typewriting machine, the comb nation with a traveling carriage, of an escapement wheel, and cooperating pawls, said wheel being formed with a series of perforations each erforation formin a surface 7 p D perpend cular to the wheel and a diametrically opposite beveled surface.

8. In a typewriting machine, the combination with a traveling carriage, of escapement mechanism controlling the movement of the carriage and comprising an escapement wheel, and cooperating pawls, said 'escapement wheel being formed with an annular series of openings, each having a portlon of its surface perpendicular to the ort-ion.

9. In a typewriting machine, te combination with a traveling carriage, of'escapement-mchanism comprising a wheel provided with perforations, the forward. surface formed by each perforation-beingperpendicular to the plane ofthe wheel, a'detent-pawl cooperating with said-'surfac'es, the. opposite surface of each perforation be ing inclined or beveled, and a spacing pawl opposite said detent pawl.

- 10. In a typewritingfmachine, the combi-' nation with a traveling carriage and.escape-' 'ment mechanism controlling the movement of the carriage, said mechanism comprising a wheel formediwith an annular series' of perforations separated ,by narrow webs. forming; ratchet teeth, each offsaid webs having a surface perpendicular to the plane r nation with a traveling'carriaggof a verticallyjdisposd escapement wheel formed Y. 'with a' series of perforations separatedby ratchetteth, a horizontally slidable frame 1 of the Wheel and an opposite inclined sun face, a d'etent pawl' cooperating with the perpendicular surfaces, and a spacing pawl cooperating with said inclined surfaces. t 1'11. In a typewriting machine, the combination of a traveling carriage and escapement mechanism therefor comprising a disk 2Qprovided with an annular series of circu-. lar erforations separated byfwebs forming ratc et teeth, a surface of each tooth formed by one. of said perforations comprising a.-

- face perpendicular-to its direct-ion of movement and. an inclined face, a detent pawl cooperating with said perpendicular' face,

copm bums patent may be obtained and a spacing pawl having a beveled or inclined surface cooperating with the inclined I .face. of the; said tooth.

I 12; In a typewriting machine, the combination of a traveling carriage and escape- .ment mechanism therefor, said" mechanism comprising"; a (ratchet I wheel provided with" a'seriesof. circular openings, each ing. s'ubstantially'to' an edge at the face ofxthe wheel, a detent pawl on one side of vthe-wheel, and a spacing pawl on the opposite side of the wheel.

3. In a typewi'iting machine, the conihi .havingiarms extending on opposite sides of v.

the eel, pawlssecured in said'arms, a universal. type baroperated frame operable to move the pawl carrying frame in one di-' rection, said pawl carrying frame being .spring-actuatedinthe opposite direction.

v FRANK A. YOUNG."

Witnesses: .i

" PAUL ZnzoN,

g FJD. Airman.

for five cents each, byaddre'ssing the Commissioner. of Patents, I

ashjngtombjcd r f 

